I had trouble following your description, so this may be pointless, but I made a small plane by "welding" brass together. It was a pain, but it worked.
You can see some of the lines. It's 4 pieces of brass, 2 sides, the sole, and the bed for the blade. The problems are similar to making a large fillet, it's possible for the whole assembly to sag. If it is possible, I might add solid brass by welding it to the other pieces. I'm not a big fan of silver and brass combos.